Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..781s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 781-784.
Astronomy and Astrophysics
Astrophysics
6
Emission Spectra, Fine Structure, Helium, Solar Prominences, Spectral Line Width, Charge Coupled Devices, Turbulence Effects
Scientific paper
The neighboring emission lines H8 and He near 3889 A were observed in a quiescent prominence at high spatial resolution. The systematic increase of the He/H8 emission ratio R towards the edges of the prominence is found to be largely cospatial with a corresponding behavior of the nonthermal line-broadening parameter Xi while the thermal broadening does not increase. The good relation between R and Xi also exists in the fine-structures. This is explained by broadening of the absorption coefficient increasing the efficiency of the exciting UV radiation preferably for the (heavier) helium. Interpretation of the nonthermal broadening parameter in terms of a velocity dispersion may favor the influence of waves.
Grupe Dirk
Stellmacher Goetz
Wiehr Eberhard
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